Summary of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Segment revenues:
Transactional and maintenance	$ 132,254		$ 129,422		$ 394,278		$ 385,759
Professional services	38,522		32,306		107,427		98,752
License	26,834		22,044		65,710		68,606
Total revenues	197,610		183,772		567,415		553,117
Segment operating expense	(161,189)		(148,564)		(456,987)		(441,709)
Unallocated share-based compensation expense	(9,345)		(6,652)		(25,631)		(18,897)
Unallocated amortization expense	(3,019)	[1]	(3,477)	[1]	(8,940)	[1]	(10,453)	[1]
Unallocated restructuring and acquisition-related	(621)		(197)		(4,281)		(3,486)
Operating income	36,421		35,208		110,428		111,408
Unallocated interest income	13		15		29		45
Unallocated interest expense	(7,064)		(7,432)		(21,305)		(23,167)
Unallocated other income (expense), net	931		830		(381)		765
Income before income taxes	30,301		28,621		88,771		89,051
Depreciation expense	5,165		5,250		15,256		14,707
Operating Segments
Segment revenues:
Segment operating expense	(148,204)		(138,238)		(418,135)		(408,873)
Operating income	49,406		45,534		149,280		144,244
Applications
Segment revenues:
Transactional and maintenance	78,915		75,537		233,592		231,174
Professional services	31,898		26,230		87,058		79,704
License	19,043		13,216		36,732		46,027
Total revenues	129,856		114,983		357,382		356,905
Depreciation expense	3,616		3,789		10,714		10,564
Applications | Operating Segments
Segment revenues:
Segment operating expense	(86,413)		(87,688)		(247,326)		(254,439)
Operating income	43,443		27,295		110,056		102,466
Scores
Segment revenues:
Transactional and maintenance	44,077		45,915		133,955		130,558
Professional services	801		806		2,167		3,333
License	452		431		4,246		770
Total revenues	45,330		47,152		140,368		134,661
Depreciation expense	213		220		623		659
Scores | Operating Segments
Segment revenues:
Segment operating expense	(11,444)		(12,977)		(32,758)		(38,457)
Operating income	33,886		34,175		107,610		96,204
Tools
Segment revenues:
Transactional and maintenance	9,262		7,970		26,731		24,027
Professional services	5,823		5,270		18,202		15,715
License	7,339		8,397		24,732		21,809
Total revenues	22,424		21,637		69,665		61,551
Depreciation expense	706		536		1,942		1,487
Tools | Operating Segments
Segment revenues:
Segment operating expense	(24,923)		(17,569)		(66,798)		(48,479)
Operating income	(2,499)		4,068		2,867		13,072
Unallocated Corporate Expenses
Segment revenues:
Depreciation expense	630		705		1,977		1,997
Unallocated Corporate Expenses | Operating Segments
Segment revenues:
Segment operating expense	(25,424)		(20,004)		(71,253)		(67,498)
Operating income	$ (25,424)		$ (20,004)		$ (71,253)		$ (67,498)

[1] Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 5 to the condensed consolidated financial statements.